What Causes Body Shaking When Starting an Automatic Transmission Car?

[McGrace]

Automatic transmission car body shaking during ignition and startup can be attributed to the following reasons: 1. Misalignment of front wheel positioning angles, excessive toe-in; 2. Low front tire pressure or imbalance caused by repairs or other factors; 3. Deformation of front wheel spokes or unequal number of tire bolts; 4. Loose installation of transmission system components; 5. Bent drive shaft, dynamic imbalance, or deformation of the front axle; 6. Failed shock absorbers, inconsistent stiffness of front leaf springs, or frame deformation. An automatic transmission eliminates the need for manual gear shifting while driving. It also includes continuously variable transmission (CVT), electronic paddle shifters, and electronic gear lever shifting. Generally, an automatic transmission has six gears: P (Park), R (Reverse), N (Neutral), D (Drive), S (Sport or Hill Climb), and L (Low).

[AndresFitz]

As a seasoned driver with over a decade of experience, when my car shakes like an earthquake during ignition, common causes include worn-out spark plugs misfiring or a clogged air filter starving the engine of air. Fuel system issues like dirty injectors causing uneven fuel spray can also lead to shaking, and worn engine mount rubber amplifies vibrations inside the cabin. I suggest first popping the hood to inspect the spark plugs—replace them with affordable brands if they're carbon-fouled. Clean or replace a dirty air filter. Persistent shaking? Immediately check for throttle body carbon buildup or fuel pump issues. Don’t underestimate minor shakes—last time I ignored it, the repair bill was hefty. Safety first on the road; early action saves money and stress, keeping your drive smooth and worry-free.

[LucyRose]

I enjoy tinkering with car parts in my spare time, and the shaking during ignition in automatic transmissions is quite annoying, often due to technical details. Faulty ignition coils cause unstable current, leading to uneven spark plug ignition and shaking; insufficient battery voltage makes starting difficult, especially noticeable in winter; and worn engine mounts transmit vibrations directly to the body. I usually use a multimeter to check the battery, ensuring it's above 12V, and inspect spark plug gaps or replace them with a new set. Simple tasks like cleaning the air filter or replacing the fuel filter can help. If I can't fix it myself, taking it to a professional shop to check the fuel system and sensors is safer to prevent the problem from worsening.

[LillianAnn]

As a new driver, I was startled when the car body shook during ignition. My friend said it could be due to poor fuel quality with high water content, leading to incomplete combustion; it might also be caused by an aging battery with unstable voltage, resulting in weak ignition; or the cold weather making the engine oil thicker, which can also cause shaking. Now, I make sure to refuel at reputable gas stations and regularly maintain my car at the 4S shop. They said cleaning the air filter would help. While driving, I stay alert because shaking might indicate minor issues. It's important not to ignore them to avoid potential dangers. Safety comes first, and simple fixes can bring peace of mind.